About Blender logo in my Youtube video
This is not a question about using Blender, licensing and legal matters are considered off topic here, we are not lawyers and cannot be liable for answers given here.
Since there is an official document about it online in the Blender official website, where you can find the recommended Blender logo usage guidelines, I will just quote it verbatim.

Blender logo usage guidelines
Blender is a registered trademark (®) of the Blender Foundation in EU
and USA. The Blender logo itself is a property of the Blender
Foundation. The logo and the brand name “Blender” are not part of the
GNU GPL, and can only be used commercially by the Blender Foundation
on products, websites, and publications.
Under the following conditions, third parties may use the Blender logo
as well:

The logo can only be used to point to the product Blender. When used with a link on a web page, it should point to the URL
blender.org.

You will visualize and promote your own branding more prominent than you use the Blender logo. The Blender logo only can be used as a
secondary brand, which means it has to be clear for an average viewer
that this is not an official Blender or Blender Foundation website,
publication or product.

You can use the Blender logo on promotion products, such as T-shirts or caps or trade show booths, provided it is a secondary
brand as described in point 2.

The logo is used unaltered, without fancy enhancements, in original colors, original typography, and always complete (logo + text
blender).

In case you use the logo on products you sell commercially, you always have to contact us with a picture of how it will be used, and
ask for explicit permission.


If you have further questions or doubts, do not hesitate to contact
us.

In short you can use it as long as you don't make it look like your product is made by the Blender Foundation, nor that you are somehow endorsed by or officially associated with it.